Geometrical OpticsHard
Question
A telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm. If a 50 m tall
tower at a distance of 1 km is observed through this telescope in normal setting, the angle formed by the
image of the tower is θ, then θ is close to :
tower at a distance of 1 km is observed through this telescope in normal setting, the angle formed by the
image of the tower is θ, then θ is close to :
Options
A.15o
B.60o
C.30o
D.1o
Solution
MP = 
= 30
θ0 =
red
θ = MP × θ0
= 30
=
= 1.5 rad
= 1.5 ×
= 86o
= 30θ0 =
redθ = MP × θ0
= 30
=
= 1.5 rad= 1.5 ×
= 86oCreate a free account to view solution
View Solution FreeMore Geometrical Optics Questions
A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then...The speed of light in media M1 and M2 are 1.5 × 108 m/s and 2.0 × 108 m/s respectively. A ray of light entres ...A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis, If the power of...A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall, for its two differ...A planet is observed by a astronomical refrecting telescope having an objective of focall length and eyepiece of focal l...